73 and later dart sport and duster usually had what you are looking for. Single piston disc brakes large bolt pattern.
If you can't locate DR Diff sells a kit. 73 and later used big ball joint upper control arms.
x2 to the Dr diff kit. I went the junkyard route and found a used set of 73 duster front brakes and then the caliper bracket to run 11.75" front disks and rebuilt everything myself. When it was all said and done I spent maybe $100 less than the Dr diff stage 2 kit (equivalent to my set up) and it took me about 9 months of searching for parts and rebuilding everything. I would go straight to him next time if I had to do it again.